**[AI Bubble Raises Concerns, South Korean Stocks Plunge 4%]** South Korean stocks plunged over 4% on Wednesday, continuing Wall Street's trend of sharp declines due to concerns over high market valuations and an artificial intelligence bubble. On the day, South Korea's KOSPI index dropped 135.79 points (3.29%) within the first 15 minutes of trading, falling below the 4000-point mark again after surpassing it for just over a week. Market leader Samsung Electronics fell 4.29%, while its chip manufacturing competitor SK Hynix dropped 4.78%. Hyundai Motor and Hanwha Aerospace both declined by more than 3%. Overnight, major U.S. stock indices closed lower, with blue-chip tech stocks like Nvidia and Palantir falling amid fears of an AI bubble. Wall Street executives indicated that the market might retreat to allow for further development.